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Dynamax, a new high-permeability magnetic material containing approximately 65 per cent (%) nickel, 2% molybdenum, and 33% iron, has been developed in the form of thin tape for toroidal cores. It has dynamic characteristics which are superior to those of any rectangular hysteresis loop materials commercially available today. The most promising potential applications are in high-performance magnetic amplifiers and possibly in special transformers. In addition, its d-c magnetization characteristics are comparable to those of Supermalloy except that the Dynamax has a rectangular hysteresis loop and higher remanance. Dynamax has d-c properties which are superior to Deltamax except for lower saturation.